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Malloc works just like any other function call.For instance, the operating system will probably prevent you from accessing memory that it knows your program doesn't own: this will cause your program to crash.Otherwise the memory gets filled up with leftovers which the computer does not know are no longer needed.Thats enough about what they zoom 1010 user manual are and how to use them in C, but why are they there in the language at all?However, just in case you have not yet come across pointers or are not familiar with C at all, I will start with a brief description of what they are (definitions) and how they are used (syntax).One confusing bit does need to be explained if one is to use pointers, that is the syntax of creating a pointer variable in the first place.Nevertheless, the pointer itself is supposed to store an address, so when you use the bare pointer, you get that address back.C was developed when computers were much less powerful than they are today and being very efficient with speed and memory usage was often not just desirable but vital.In this case, this is not even hidden in the syntax of the command to initially create the string where it is blatantly created as pointer to a variable of type char.
Well, if we later rewrite the declaration of ptr the following, then we would only have to rewrite the first part of it: float *ptr malloc( sizeof ptr) We don't have to go back and correct the malloc call to use sizeof(float).
The function malloc, residing in the stdlib.
To avoid crashing your program, you should always initialize pointers before you use them.The reason why something as confusing as pointers are so commonly used in C is rarely mentioned but is very helpful in understanding how to use them.However most modern programmers do not need such fine control and the complications of using pointers make programs less clear to understand and add to the ways in which they can be go wrong.You'll probably do that an awful lot.Sponsored Links Download Discrete mathematics and its applications 7th edition solutions manual PDF Discrete Mathematics and its Applications by Kenneth H Rosen is one most important book mainly used by the students.